Peloponnesian War  
   English translation by Richard Crawley [ICA].
   http://classics.mit.edu/Thucydides/pelopwar.html

Histories  
   English translation of Thucydides' History of the Peloponnesian War [Perseus]. Three versions in Greek also available.
   http://www.perseus.tufts.edu/cgi-bin/text?vers=English%7Cnone&lookup=thuc.+1.1.1&browse=1

Peloponnesian War Timeline [About.com]  
   Timeline of the treaties and fighting among the Greek city-states in the Peloponnesian War.
   http://ancienthistory.about.com/library/bl/bl_time_pelopwars.htm

After the Peloponnesian War - Thirty Tyrants Replaced Democracy with Oligarchic Rule in Athens  
   The treaty between Athens and Sparta at the end of the Peloponnesian War and its aftermath. [About.com]
   http://ancienthistory.about.com/library/weekly/aa022703a.htm

Ancient Greece: The Pelopponesian War  
   Richard Hooker's module on the history of the sequence of events and alliances in the Peloponnesian War.
   http://www.wsu.edu/~dee/GREECE/PELOWARS.HTM

HWC, The Peloponnesian War  
   Dr. Ellis L. Knox breaks up the history of the war into 17 chapters, with suggestions for further reading.
   http://history.boisestate.edu/westciv/peloponn/